While we're on the subject of Photoshop, I highly encourage you to try Lightzone as an alternative to Photoshop for working with fine photographic images.
The CS3 upgrade for Adobe Photoshop Mac is, like, due any day now.
Wishing your Mac had a built-in iSight with Photobooth? No worries, try DotMatrix which is much cooler, works with almost all webcams _and_ external firewire video cameras.